MESON Chess Problem Database

Problem Display
PID: 163518 (3R2n1/1pp5/nBk2bR1/P4p1K/4bQ2/N2p4/3P4/8 w - - 0 1)

Sumner, Christopher Richard Benson

The Observer, 1925

(First published on Sun Aug 16 1925)

3R2n1/1pp5/nBk2bR1/P4p1K/4bQ2/N2p4/3P4/8

#2

8 + 9

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Bh1
      • 2.Qa4#
    • 1...Bg2
      • 2.Qa4#
    • 1...Bf3+
      • 2.Qxf3#
    • 1...Bd5
      • 2.Qa4#
    • 1...Sb4
      • 2.Qxc7#
    • 1...Sc5
      • 2.Qxc7#
    • 1...Sb8
      • 2.Qxc7#
    • 1...Sh6
      • 2.Rxf6#
    • 1...Se7
      • 2.Rxf6#
    • 1...cxb6
      • 2.Qd6#
  • Tries
    • 1.Rh6?
      • 1...Bf3+
        • 2.Qxf3#
      • 1...cxb6
        • 2.Qd6#
      • 1...Bh1
        • 2.Qa4#
      • 1...Bg2
        • 2.Qa4#
      • 1...Bd5
        • 2.Qa4#
      • 1...Sb4
        • 2.Qxc7#
      • 1...Sc5
        • 2.Qxc7#
      • 1...Sb8
        • 2.Qxc7#
      • 1...Se7
        • 2.Rxf6#
      • 1...Sxh6!
    • 1.Qe5?
      • threat
        • 2.Qb5#
        • 2.Qe6#
        • 2.Qe8#
      • 1...cxb6
        • 2.Qd6#
      • 1...Bd5
        • 2.Qxd5#
        • 2.Qe8#
      • 1...Sc5
        • 2.Qxc7#
        • 2.Qxc5#
      • 1...Sb8
        • 2.Qc3#
        • 2.Qxc7#
        • 2.Qb5#
        • 2.Qc5#
        • 2.Qe6#
      • 1...Se7
        • 2.Rxf6#
        • 2.Qxf6#
        • 2.Qb5#
        • 2.Qe6#
      • 1...Bf3+!
  • Keys
    • 1.Qe3!
      • 1...Bf3+
        • 2.Qxf3#
      • 1...cxb6
        • 2.Qxb6#
      • 1...Bh1
        • 2.Qe6#
        • 2.Qe8#
      • 1...Bg2
        • 2.Qe6#
        • 2.Qe8#
      • 1...Bd5
        • 2.Qe8#
      • 1...Sb4
        • 2.Qc5#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sb8
        • 2.Qc5#
      • 1...Sh6
        • 2.Rxf6#
      • 1...Se7
        • 2.Rxf6#
      • 1...f4
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 5
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • B(b);OGATE::QAB(C)
    • B(b);CHECK,OGATEB::QAB(C),XB(b)
    • S(d);N_GUARD::QAR1(C),XP(h)
    • S(i);N_GUARD::R(G),XB(f)
    • P(h);N_GUARD,XB(F)::QAR1(C)
  • Tries
    • Try
      • R(G);
      • Vars
        • B(b);CHECK,OGATEB::QAB(C),XB(b)
        • P(h);N_GUARD,XB(F)::QAR1(C)
        • B(b);OGATE::QAB(C)
        • S(d);N_GUARD::QAR1(C),XP(h)
        • S(i);N_GUARD::R(G),XB(f)
      • Refutation
        • S(i);N_SPINB(f),XR(G)
    • Try
      • Q(C);
      • Threat
        • DUALS(3)
      • Vars
        • P(h);N_GUARD,XB(F)::QAR1(C)
      • Refutation
        • B(b);CHECK
  • Actual
    • Q(C);
    • Vars
      • B(b);CHECK,OGATEB::QAB(C),XB(b)
      • P(h);OGATE,XB(F)::QAR1(C),XP(h)
      • B(b);OGATE::QAB(C)
      • S(d);N_GUARD::QAR1(C)
      • S(d);N_GUARD::QAR1(C),XS(d)
      • S(i);N_GUARD::R(G),XB(f)
      • P(c);N_GUARD::QAB(C),XB(b)
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